Corrosion Behavior of Mild Steel and SS 304L in Presence of Dissolved Copper

Abstract

The failure of steel components in multistage flash (MSF) desalination or power plants as a result of the deposition of carryover heavy metals/oxides is a common problem and reported by many authors. The present investigation was undertaken to study the corrosion behavior of mild steel and AISI 304L SS in presence of dissolved Cu ions under different experimental conditions. The experimental conditions include: variation in aqueous medium, Cu ion concentration, pH and flow condition. The corrosion rate of mild steel and SS 304L in presence of different concentration of Cu was determined by weight loss measurements and solvent analysis of iron ions into the test solution after completion of immersion. The amount of Cu ions present in the test solution after completion of immersion was also estimated using Atomic absorption spectrophotometer. The pH of the test solution was monitored during the entire period of immersion. Electrochemical techniques like free corrosion potential measurements and potentiodynamic polarization measurements were carried to find out the role of Cu ions on the corrosion behavior of mild steel and SS 304L. The effect of Cu on corrosion rate of mild steel is quite pronounced and follows interesting trend. However, SS 304L is not affected either in distilled water or artificial seawater and do not show any significant variation in corrosion rates in presence of Cu ions.

Corrosion Resistance of Heat-Treated NST 37-2 Steel in Hydrochloric Acid Solution

“…Since rust formation is known to be water and oxygen permeable, the passivity of the surface tends to breakdown progressively, hence resulting in reduction in corrosion rate of the material. Similarly, nonlinear trends in corrosion-time curves of 18/8 stainless steel and nickel-plated low carbon steel in cassava fluid [29], and mild steel and SS 304L in presence of dissolved copper [30] have been reported by other researchers. In contrast, linear relationship has been reported for chromium-nickel alloy steel in 0.1 M HCl solution [19].…”

Effect of Incomplete Replacement of Cr for Cu in the Deposited Alloy of Fe–C–Cr–B–Ti Alloying System with a Medium Boron Content (0.5% wt.) on its Corrosion Resistance

“…Corrosion rate decrease with increasing Cu concentration may be connected with precipitation of renewed Cu on the steel surface, which forms a protective barrier against further steel oxidation. Oxidationreduction reaction with a presence of Cu 2+ on the steel surface was proposed by Mobin and Shabnam [104]:…”

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“…Corrosion rate decrease with increasing Cu concentration may be connected with precipitation of renewed Cu on the steel surface, which forms a protective barrier against further steel oxidation. Oxidationreduction reaction with a presence of Cu 2+ on the steel surface was proposed by Mobin and Shabnam [104]:…”